What is Wood Movement? See what happens when wood can't move | Woodworking
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- Опубликовано: 10 июл 2018
- Have you heard of wood movement, but don't know what it is or why it's important for woodworking? See a table that was destroyed because of wood movement and learn how to prevent it from happening to your woodwork.
This table was repair several times and unfortunately, the people that repaired it did't understand wood movement. Because of that, this table top has been damaged beyond repair.
Due to popular feedback on this video, we will be making a follow up video to show the new table top. Subscribe and click the bell icon to be notified when our videos are published.
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#wood #woodmovement 
Хобби
Definitely want to see a finished product.
It seems like a common request... based on your feedback, I will film the assembly and the finished table. Thanks for your comment to prompt me to show the repair work.
Here's a link to the finished table. Let us know what you think - ruclips.net/video/9hi-kvWtqPM/видео.html
You're a good teacher. Taught me something.
Thank you of your feedback Bryan. Happy it's helpful
Thanks for posting this. I have been wanting to see actual examples of damage from wood movement. Many youtube posters talk about it, but you are the first I've seen who shows real-life examples.
I'm happy you found this helpful. Cheers. Scott
Ha! I found this in the exact same quest. I just watched a video where someone said they were veneering because veneer on plywood allowed for directly attaching the legs to a cabinet since it wouldn't move... made me think of all the times I've heard of people allowing for movement and never seeing an actual failure.
Very concise and informative.
Thank you for the feedback
very good explanation, thank You!
Poul Eichel thanks for your comment Poul
Proper jointing is necessary too. Both face edges must be straight, especially when joining boards edge to edge, to create a wider board.
omg that poor table sure was lucky to end up with you!
Well than you Jo! Cheers. Scott
I remember a story my father told me when he worked in the Philippines (he's from Canada) - he built a table using local wood and that night when he was asleep - he heard a loud CRACK! - the table top had split. The culprit he said, ran off into the night.
That's quite a story!
Great job explaining wood movement. That table has had a hard life. Are you going to restore it or is there another plan for it?
My customer loves the table as it has some sentimental value for them. The top can't be repaired as it's damaged in so many ways. I'm building a new top and 3 new leaves. The base will be refinished and the top finished to match. I'm almost through the build part now and my finisher is picking up the table next week to do the finishing work.
Here's a link to the finished table. Let us know what you think - ruclips.net/video/9hi-kvWtqPM/видео.html
So to prevent the issue you had in the table you built 20 years ago, securing the top to the apron with an oversized mortise would help? Something like a domino on the medium or large setting?
There are a few different ways you can approach attaching a top to allow for wood movement. The simplest is attaching a runner to the apron and drilling elongated holes for screws to go into the top. I recently used angle brackets to attach a desk top - here's the video ruclips.net/video/zjP6PpPvHgY/видео.html
Hi
thank you for posting this video. I have read book titled understanding wood and I understand wood movement but I also have real life examples that contradict such movement
Here are some examples:
1- in Michigan I have a house with solid oak flooring and in winter I measured relative humidity to be 20% and over 80% in summer as there is no air conditioning unit running. According to book on understanding wood, the floor should expand several inches giving it is over 10' wide. Can you please explain why wood floor does not busy the walls around or crack?
2- in my new house in Illinois, the oak treads are nailed to risers both in front and back so there is no room for oak treads to move. Why treads don't crack with air conditioning only running sometimes in the summer?
I am ready to install oak treads on old stair in Michigan where humidity is going to vary a lot. Can you please advise on how to install such new treads? So far every video I watched on RUclips butted the tread against the riser and nails were used there to nail new treads over old treads. Based on your video and what I read, such treads should crack in the upcoming summer
Any instructions on how to properly install oak treads and risers over old treads and risers would be greatly appreciated.
Thanks
Some good questions Mimi.
1) A wood floor expands and contracts one board at a time. When the relative humidity is low, you will notice tiny gaps between the boards. When the humidity is high, the gaps will be closed up. In addition, if you have 1/4 sawn oak floors, they move much less than flat sawn boards. 1/4 sawn oak can be identified by looking for "ray flecks" across the grain of the wood.
2) I would guess the oak treads are stronger than the construction material below them, so the nails may be moving below the tread where there is less tension... that's my best guess
I wouldn't butt the tread against the riser, I would put the riser on top of the tread, therefore allowing the wood to move underneath the riser. I'm not a stair expert, so I suggest calling a professional installer and asking them that question. I hope that helps. Scott
@@HomeImprovementWoodworking Hi Scott
Thank you for the reply. In the case I mentioned, everything is made out of solid oak so the nailing is to solid oak.
I agree with u that putting the riser above the tread will eliminate the riser from getting impacted by movement by the tread. However, that does not solve the problem of how you would attach the tread to the existing tread. Also this creates another problem as the riser has no support where it meets the tread and this is needed since shoes will bump into the riser where riser meets the tread.
I did talk to the company that makes construction adhesive and they said that it has to polyurathane based which apparently will flex with wood movement but they also said that I have to nail the tread.
Everyone talks about wood movement but no one can explain many examples, real life examples, of why the wood did not crack.
Here is my current plan:
1- attach riser to tread through groove. This provides support needed.
2- when installing combined tread/riser, keep riser away from rough riser by 1/4" which is expected expansion.
3- hold on finishing this project till tread moisture content is around 14% which is the same as relative humidity of 50%. This will limit my wood movement.
4- nail riser to above tread as is the case in my professionally installed oak stairs. My logic for this being ok is that all treads should move by equal amount with change in relative humidity and that may be the reason why my professionally installed oak stairs don't crack even though each riser is nailed to treads around it.
Thanks
I would love to see the table once u fix it
Glad you asked! I'm about to assemble the new table top. I will make a follow up video to show you how it goes together and what it looks like.
GREAT can't wait love seeing before and after when the person know what he is doing
Here's a link to the finished table. Let us know what you think - ruclips.net/video/9hi-kvWtqPM/видео.html
How to keep wood glued panels from cupping in the first place... or how to plan for it?
The best plan is to use quality kiln-dried lumber. Then when you glue them up, alternate the growth rings (look at the board from the end) so one board has the growth rings facing up, the next one down, the next one up, etc. That way when the wood expands it minimizes the cupping across the table. I hope that's helpful. Scott
Question does this only happen in Northern climates I live in the southwest of the U.S. by the ocean but have not seen this penonemon here.
That's a good question. Does the humidity in the air change between summer and winter where you live? It's the change in humidity that causes the wood to move.
Thanks for answering that for me. I live in a very stable climate in San Diego California. I even build outside and as long as I cover my projects at night they seem ok. Also never really heard of it being a problem for my brother in law who is a finish carpenter.
@@caruniv3287 Hi Carl. Let's compare the lowest and highest humidity point on an annual basis. In Toronto, the average monthly relative humidity ranges from 54% in July to 71% in January. In San Diego, it's 68% to 76%, so the humidity swing is less dramatic.(17% vs 8%). In some woods a 5% change in humidity means a 1% change in the dimension of the wood. There is more wood movement comparing these 2 cities. If you're curious, search the city name and "humidity range". I hope that helps. Scott
@@HomeImprovementWoodworking
You have provided some good info. I can see how that would be a bog problem in some parts of the world. I look forward to more informative videos.
@@caruniv3287 I'm filming a repair related to wood movement in the workshop right now. It will be out next weekend on our other RUclips channel - Fixing Furniture ruclips.net/user/fixingfurniture
Wood movement occurs: 1. If the wood is not seasoned properly; & 2. If the end grains are not coated...in most cases
Perfectly explained. I have detachable furniture, but the joints have become too loose making the structure unstable to sit on, I am wondering how to fuse all joints with glue but I'm worried about wood movement, any suggestions?
Those nails did not cause those splits but hence was to prevent any further splitting. SMH
I thought wood always moves with the grain and not across it? Great..... 😳
Glad you found this helpful. Here's another explanation and example wood movement - ruclips.net/video/pmM1APci8TY/видео.html
What wrong with gaps in the top. Maybe some people like to read the morning paper through the top ?...😁
Why do you post videos on lumber jock but don’t participate in the forums?
Or do you🤔
Hi Aj. Yes, I do participate in the forums on Lumber Jocks. What forums do you like the best there?
I only surf the woodworking forum. The other forums are full of spammers last time i checked. I’m Aj2 if you want to friend me I’m 😎.
You been gifted a good camera presence unlike me. So I don’t make videos but I do share my work.👍
I wasn't aware that Lumber Jocks had a "Buddies" feature. I've just added you as my first buddy! Cheers!
Moved the likes off the devil's number.
Thanks!